<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="name">
        <input type="button" value="change" @click="changeName">
        <h2 v-show="isDisplay">
            {{ name }}
        </h2>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data:{
                name: "",
                isDisplay: false,
            },
            methods:{
                changeName: function(){
                    this.isDisplay = true;
                }
            }

        })
    </script>
</body>
</html>